In his keynote address at WWDC, Tim Cook couldn't resist dissing Microsoft, at several points badmouthing the paltry growth of PCs and Windows 8, and contrasting them with Apple's much bigger growth numbers. Size certainly does matter...but are Cook's claims really accurate?

He's right about growth rates. But in terms of sheer volume, Windows machines far outstrip Macs. They don't have quite the monopoly that they used to in times past, but Windows is by far the dominant operating system for traditional computers in the world today. And it will stay that way for many years into the future.

Then again, if you take iOS devices into account, Apple certainly beats out Microsoft. And Apple's market share will certainly grow faster than Microsoft's, given the success of iOS devices compared to Windows tablets and Windows Phone devices.

So give Cook his due. Apple has clearly been outperforming Microsoft. He gets to brag all he wants.